Device for preventing the overthrow of gears.



P. THINKS. DEVICE FOR PREVENTING THE OVBRTHR-OW 0E GEARS.

7 APPLICATION FILED SEPT.11, 1911 1 0 4 5, Patented Feb. 24, 1914.

2 SHEETS-SHEET 1.

P. TRINKS.

DEVICE FOR PREVENTING THE OVERTHROW or GEARS. APPLICATION FILED SEPT. 11, 1911.

Patentd Feb.24, 1914.

2 BKEETS BHEET 2.

UNITED STATES PATENT OFFICE.-

' FRANZ THINK-S, or BRUNSWICK, GERMANY.-

DEVICE FOR PREVENTING THE OVER/THROW OF GEARS.

Application filed September b (1. whom if m 1 com-cm .Be it known that I, FRANZ THINKS, engineer, a subject of the Duke of Brunswick, residing at Brunswick, Duchy of Brunswick, Empire of Germany, have invented certain new and useful Improvements in Devices for Preventing the Overthrow of Gears, of which the following is a specification. v

My invention relates to improvements in devices for preventing the overthrow of gears,- and more particularly to s tiring'actuated devices which are combined with gear wheels for the purpose of pi'even'ti the same from being overthrown after being released from theindriving means. Devices of this kind are used for example in combination with the gear wheels of calculating machines in order to arrestthe same upon their disengagement from ,their driving members. In such cases the arresting means consist of a spring actuated pawl which ongages in the teeth of the driven gear wheel,

as is shown for example in the patents of the United States Nos. 928,083, 953,622, and 957,062. In the operation of the gear wheels engaged by-an arresting device of the character referred to the resistance of the gear wheels is increased by the spring actuated pawls and an objectionable noise is produced. In cases where the number of the wheels to be simultaneously rotated is large, as is the case for example in calculating machines, v the resistance of the mechanism is very large.

In order to reduce the resistance of the gears and the noise caused by the operation thereof it has been suggested to release the ai'. resting devices when rotating the gears and to hold the same in released position while rotating the gears (see Patent No. 957,062), or to rock the arresting means and the rear abutments of their springs out of operative position during suchrotat-ion of the gears (see German Patent No. 208,811.). However these constructions are complicated and require much space. I v

The object or my improvements is to provide means of the character. described which are more simple in construction. And with this object in view my invention consists in of. normal position suliiciently to bring the same out of engagement with their arresting devices, and providing means cooperating Specification of Letters Patent.

, i'ocking'or'shifting the gears themselves out Patented Feb. 24, 1914.

11, 1911. Seria1No.648,765.

gears under .the action of their springs. buch means may either be provided separately -for each arresting device, or they may be common to all the arresting devices. In order that my invention may more clearly be understood an example embodying the same has been shown in the accompany reference have been used in all the views to indicate corresponding parts.

view of a calculating machine of known construction with its casin partly removed and illustrating an example of a gearing in which my invention may be embodied, Fig. 2, is a vertical cross-section taken on the liiie'22 of Fig. 1. A

In describing the invention reference will be had to a calculating machine provided with the improved arresting mechanism. But I wish it to be understood, that my in vention is not limited to the combination of the arresting means with the gearing of a calculating machine, and that it may advantageously be used in other combinations. It will also be understood, that my invention is not limited to the construction of the arresting devices shown in the drawings, and that various changes may be made in the construction of parts within the gist of my invention.

Reference will now be had to the drawings.

A rotary shaft 63, mounted in a'pair of side walls 61 and 62, is operatively connectgears 65 and 66, and it carries a p urality of setting disks 67 each of which is provided with nine radially shiftable teeth 68, engaged by a cam disk 69. In front of the said setting mechanisms 67, 68, 69,69, nu-

shaft 9 disposed parallel to the shaft 63. Each numeral wheel, the numerical characters of which are visible through a. peep hole -72' in a cover 72, hasfla spur gear 73 mission wheel 13, loosely mounted on a shaft 12. The said transmission wheels 13 are located in the plane of the radially shift able teeth 68 of the setting disks 67.

Carrying means are provided between consecutive numeral wheels; In the example illustratedthe counting wheels 7 are provided with hammer-shaped carrying levers 76, loosely mounted on a shaft 76' dis- In said drawings-F1gure 1, is a front iug drawings in which the sameletters of i edavith the machine crank 64 tlirou h spur mcral wheels 7 are loosely mounted on a which is in mesh with the teeth of atranswheels 78, andtheir carrying le posed parallel to the axis 9. The levers 76 extend with their free upper ends 76 in known manner in the path of pins 7 of the numeral wheels 7, whereby the levers "56 are rocked, when the numeral wheels pass from their 9 position into their 0 poa second registering mechanism 78 is provided for counting tie revolutions ofthe machine crank, which revolutions counting mechanism 1s actuated from the shatt 63 by mea ns'of a single tooth wheell'g advancing a spur gear-80. Each of the numeral wheels is connected with a gearing 81, and all/the gear wheels 80 meshing with the gearings 81 are loosely mounted on a shaft 84 disposed parallel to the shaft T0 of the registering mechanism 128.

Both registering m chanisms 7 '1" 8 are provided with resetting mechanisms adapt ed to set the numeral wheels into their zero positions. At its outer end the shalt 9 carries a nut 11, and within each oi. the numeral wheels '7 it is provided with a radial pin 9, cooperating with an abutment 10 or" the numeral wheels 7. Upon rotation of theshaft 9 by means of the nut 11 the sh 9 is shifted laterally against the action a spring 89 by means of a cam ice 88, that the pins 9 are shifted into he oath the abutments 10 whereby the wheels 'Z are turned to their zero positions. Resetting mechanisms of the same construction are provided on the shaft 71 which carries nut 90 at its outer en Short sleeves 85 prevent the axial displacement the wheels 7 and 78.

Referring now to the parts of the machine to which my invention more particularly relates, reference will be had to Figs. 3 and 4 of the drawings in which the preferred form of my arresting devices and the means for temporarily rendering the same inoperative are shown. As shown the numeral wheels 7 (and wh re second registering mechanism is prov ded) the numeral mounted on a carriage l whie in a direction parallel to (or 78) are spring actuated arresting pa wls a s t prevent the numeral wheels from being over thrown upon the release of the transmission wheels 13 (80) from their driving gears 68 ('79). W hen resetting the numeral disks 7 or 78) by means of the thumb nuts 11 (or 90) the resistance of all the springs l must be overcome, so that a considerable force must be exerted by the operator on the thumb nuts by r ason of their small leverage, lhis is inconvenient particularly Where the machine is frequently used. Besides the arresting pawls cause a vehement trembling of the machine and an objectionable rattling noise. These objeetibns this purpose the shaft 12,-which carries the transmission gearsl? coo crating with the gear wheels 73 is cquippec with two arms 3 which are rigidly mounted thereon and carry the shaft 9 of the wheels 78. The pawls 2 are formed with arms 5 which extend rearward therefrom and are adapted to bear on projections 6 provided on the carriage whereby the pawls are prevented from being thrown upward by their springs upon the disengagement of the gear Wheels 73 from the pawls 2.

li it is desired to rotate the wheels 73 without arresting the same the shaft 9 is first shifted in the direction of the arrow 16 shown in. Fig. 3 until the pawls 2 are out of engagement with the gear Wheels 73, whereupon rotation begins. As the gear wheels 73 are always in engagement with the transmission wheels 13 they can not assume a wrong position relatively to the gears 13. V

The rocking of the gears? and 73 can be effected either by hand or automatically from any suitable member, for example from.

the resetting shaft 9 which for this pur ose may be provided with a cam disk 8 ri ing upon rotation of the shaft 9 on a projection of the carriage, so as to lift the resetting shaft 9.

Where a number of gear wheels 73 is provided the projections 6 may be com structed in the form of a rail which is common to all the pawls .2, as is shown in Fig. in which the rail has been indicated by the numeral 6. 4

I claim herein as my invention:

Zn gearing, the combination of a ftable and rotatable member, a deyice vapted to prevent the member from being overth own and to permit movement thereof, said device bein positively held in normal position when the member is-shifted th refrom, and 'means for shifting said member out of engagement with said device. 2. in a gearing, the combination of a shiftable and rotatable member, a device adapted to prevent the member from being overthrown and to permit movement thereof, means for shifting said member out of are efi ectively' avoided by my improved mechanism. For

engagement with said device, and positive resisting means for said device'in normal position when moving the member out of engagement therewith.

- In a gearing, the combination of a shiftable androtatable gear wheel, aspring actuated device cooperating with said gear wheel and adapted to prevent the same from being overthrown and to permit rotation thereof, means for shifting said gear wheel out of cooperation with 'saidspring actuated device, and means for preventing said spring actuated device from following the gear wheel when being thrown out ofeooperation with the spring actuated means.

4. In a calculating machine, the combination with the setting mechanism, and registering mechanism, a shiftable gear wheel adapted to transmit .values from said setting mechanism to said registering mechanism, a spring actuated pawl adapted to engage said gear wheel to prevent overturning of the latter,means to limit the movement ofsaid pawl toward the gear wheel, and means to move said gear wheel out of engagement with the pawl.

5. In a calculating-machine, the combination with the setting mechanism, and registeringmeehanism, of a plurality of shiftable gear wheels adapted to transmit values from said setting mechanism to said registering mechanism, spring actuated pawls adapted to engage said gear wheels, means common to all the pawls to limit the movement of said pawls toward the gear wheels, andv means to swing said gear wheels out of and into engagement with the pawls.

6. In a calculating machine, the combination of the setting mechanism, a numeral wheel, a gear wheel connected therewith, a resettin shaft loosely supporting said numera wheel and gear wheel, and resetting means cooperating with said shaft and immoral wheel, a spring actuated pawl engaging said gear wheel, and permitting rotation thereof and adapted to prevent the same from being overthrown, means to limit the movement of said'pawl toward the gear wheel and a camdisk secured to said resetting shaft and adapted upon rotation of said shaft tofiswing the gear wheel out of engagement withsaid pawl. i

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. 1

FRANZ THINKS.

Witnesses WILHELM LEHRKE, J ULIUSSEGKEL. 

